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class="vertical-menu-item heading level-2 collapsed ng-star-inserted" title="Observable 与 RxJS" aria-pressed="false"><span>Observable 与 RxJS</span><mat-icon role="img" svgicon="keyboard_arrow_right" class="mat-icon notranslate rotating-icon mat-icon-no-color" aria-hidden="true"><svg focusable="false" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><path d="M8.59 16.34l4.58-4.59-4.58-4.59L10 5.75l6 6-6 6z"></path></svg></mat-icon></button><div class="heading-children level-2 collapsed"><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-3 collapsed ng-star-inserted" style="position:relative" href="guide/observables" title="" target="_self"><span>可观察对象(Observable)</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-3 collapsed ng-star-inserted" style="position:relative" href="guide/rx-library" title="" target="_self"><span>RxJS 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collapsed ng-star-inserted" title="Angular 中的模块" aria-pressed="false"><span>NgModules</span><mat-icon role="img" svgicon="keyboard_arrow_right" class="mat-icon notranslate rotating-icon mat-icon-no-color" aria-hidden="true"><svg focusable="false" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><path d="M8.59 16.34l4.58-4.59-4.58-4.59L10 5.75l6 6-6 6z"></path></svg></mat-icon></button><div class="heading-children level-2 collapsed"><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-3 collapsed ng-star-inserted" style="position:relative" href="guide/ngmodules" title="使用 NgModule 让你的应用更高效" target="_self"><span>NgModule 简介</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-3 collapsed ng-star-inserted" style="position:relative" href="guide/ngmodule-vs-jsmodule" title="JavaScript 模块和 NgModule 之间的差异" target="_self"><span>JS 模块 vs NgModule</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-3 collapsed ng-star-inserted" style="position:relative" href="guide/bootstrapping" title="告诉 Angular 如何在根 &quot;AppModule&quot; 中构造和引导应用。" target="_self"><span>应用的根模块</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-3 collapsed ng-star-inserted" style="position:relative" href="guide/frequent-ngmodules" title="介绍最常用的 NgModule" target="_self"><span>常用模块</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-3 collapsed ng-star-inserted" style="position:relative" href="guide/module-types" title="介绍特性模块的几种类型" target="_self"><span>特性模块的分类</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-3 collapsed ng-star-inserted" style="position:relative" href="guide/entry-components" title="关于 Angular 中入口组件的一切" target="_self"><span>入口组件</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-3 collapsed ng-star-inserted" style="position:relative" href="guide/feature-modules" title="创建特性模块，以组织你的代码" target="_self"><span>特性模块</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-3 collapsed ng-star-inserted" style="position:relative" href="guide/providers" title="服务提供者与 NgModule" target="_self"><span>服务提供者</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-3 collapsed ng-star-inserted" style="position:relative" href="guide/singleton-services" title="创建单例服务" target="_self"><span>单例服务</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-3 collapsed ng-star-inserted" style="position:relative" href="guide/lazy-loading-ngmodules" title="惰性加载模块，以提高应用的性能" target="_self"><span>惰性加载的特性模块</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-3 collapsed ng-star-inserted" style="position:relative" href="guide/sharing-ngmodules" title="共享 NgModule 让你的应用现代化。" target="_self"><span>共享 NgModule</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-3 collapsed ng-star-inserted" style="position:relative" href="guide/ngmodule-api" title="理解 NgModule 的那些细节。" target="_self"><span>NgModule API</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-3 collapsed ng-star-inserted" style="position:relative" href="guide/ngmodule-faq" title="回答关于 NgModules 的常见问题。" target="_self"><span>NgModule 常见问题</span></a></div></aio-nav-item></div></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><button type="button" class="vertical-menu-item heading level-2 collapsed ng-star-inserted" title="依赖注入：创建并注入各种服务。" aria-pressed="false"><span>依赖注入</span><mat-icon role="img" svgicon="keyboard_arrow_right" class="mat-icon notranslate rotating-icon mat-icon-no-color" aria-hidden="true"><svg focusable="false" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><path d="M8.59 16.34l4.58-4.59-4.58-4.59L10 5.75l6 6-6 6z"></path></svg></mat-icon></button><div class="heading-children level-2 collapsed"><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-3 collapsed ng-star-inserted" style="position:relative" href="guide/dependency-injection" title="Angular 的依赖注入系统能够为 Angular 创建的类创建并交付它们所依赖的服务。" target="_self"><span>Angular 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level-3 collapsed ng-star-inserted" style="position:relative" href="guide/dependency-injection-navtree" title="使用注入器树来查找父组件。" target="_self"><span>浏览组件树</span></a></div></aio-nav-item></div></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-2 collapsed ng-star-inserted" style="position:relative" href="guide/http" title="通过 HTTP 协议与远程服务器对话。" target="_self"><span>HttpClient</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-2 collapsed ng-star-inserted" style="position:relative" href="guide/router" title="揭示如何通过 Angular 路由进行基本的屏幕导航。" target="_self"><span>路由与导航</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><button type="button" class="vertical-menu-item heading level-2 collapsed ng-star-inserted" title="Angular 动画系统指南" aria-pressed="false"><span>动画</span><mat-icon role="img" svgicon="keyboard_arrow_right" class="mat-icon notranslate rotating-icon mat-icon-no-color" aria-hidden="true"><svg focusable="false" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><path d="M8.59 16.34l4.58-4.59-4.58-4.59L10 5.75l6 6-6 6z"></path></svg></mat-icon></button><div class="heading-children level-2 collapsed"><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-3 collapsed ng-star-inserted" style="position:relative" href="guide/animations" title="Angular 动画的基础技术。" target="_self"><span>简介</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-3 collapsed ng-star-inserted" style="position:relative" href="guide/transition-and-triggers" title="转场与触发器的高级技术。" target="_self"><span>转场与触发器</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-3 collapsed ng-star-inserted" style="position:relative" href="guide/complex-animation-sequences" title="复杂的 Angular 动画序列。" target="_self"><span>复杂序列</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-3 collapsed ng-star-inserted" style="position:relative" href="guide/reusable-animations" title="创建可复用的动画。" target="_self"><span>可复用动画</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-3 collapsed ng-star-inserted" style="position:relative" href="guide/route-animations" title="为路由提供转场动画。" target="_self"><span>路由转场动画</span></a></div></aio-nav-item></div></div></aio-nav-item></div></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><button type="button" class="vertical-menu-item heading level-1 collapsed ng-star-inserted" title="把 Angular 用到你的实际工作中的一些技巧" aria-pressed="false"><span>其它技术</span><mat-icon role="img" svgicon="keyboard_arrow_right" class="mat-icon notranslate rotating-icon mat-icon-no-color" aria-hidden="true"><svg focusable="false" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><path d="M8.59 16.34l4.58-4.59-4.58-4.59L10 5.75l6 6-6 6z"></path></svg></mat-icon></button><div class="heading-children level-1 collapsed"><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-2 collapsed ng-star-inserted" style="position:relative" href="guide/security" title="Angular 应用开发中的安全技术。" target="_self"><span>安全</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-2 collapsed ng-star-inserted" style="position:relative" href="guide/i18n" title="把应用模板中的文本翻译成多种语言。" target="_self"><span>国际化（i18n）</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-2 collapsed ng-star-inserted" style="position:relative" href="guide/accessibility" title="设计能被所有用户访问的应用" target="_self"><span>无障碍（a11y）</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><button type="button" class="vertical-menu-item heading level-2 collapsed ng-star-inserted" title="Angular Service Worker: 控制应用资源的缓存。" aria-pressed="false"><span>Service Worker 与 PWA</span><mat-icon role="img" svgicon="keyboard_arrow_right" class="mat-icon notranslate rotating-icon mat-icon-no-color" aria-hidden="true"><svg focusable="false" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><path d="M8.59 16.34l4.58-4.59-4.58-4.59L10 5.75l6 6-6 6z"></path></svg></mat-icon></button><div class="heading-children level-2 collapsed"><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-3 collapsed ng-star-inserted" style="position:relative" href="guide/service-worker-intro" title="Angular 对 Service Worker 的实现提升了慢速或不稳定的网络连接下的用户体验。" target="_self"><span>简介</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-3 collapsed ng-star-inserted" style="position:relative" href="guide/service-worker-getting-started" title="在 CLI 项目中启用 Service Worker，并在浏览器中查看效果。" target="_self"><span>快速上手</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-3 collapsed ng-star-inserted" style="position:relative" href="guide/app-shell" title="在 CLI 项目中启用应用外壳。" target="_self"><span>应用外壳</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-3 collapsed ng-star-inserted" style="position:relative" href="guide/service-worker-communications" title="那些能让你和 Angular 的 Service Worker 通讯的服务类。" target="_self"><span>与 Service Worker 通讯</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-3 collapsed ng-star-inserted" style="position:relative" href="guide/service-worker-devops" title="使用 Service Worker 运行应用、管理应用更新、调试以及杀掉正在运行的应用。" target="_self"><span>生产环境下的 Service Worker</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-3 collapsed ng-star-inserted" style="position:relative" href="guide/service-worker-config" title="配置 Service Worker 的缓存行为。" target="_self"><span>Service Worker 配置</span></a></div></aio-nav-item></div></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-2 collapsed ng-star-inserted" style="position:relative" href="guide/universal" title="使用 Angular Universal 在服务端渲染 HTML。" target="_self"><span>服务端渲染</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><button type="button" class="vertical-menu-item heading level-2 collapsed ng-star-inserted" title="把 AngularJS 应用增量式的升级到 Angular。" aria-pressed="false"><span>从 AngularJS 升级</span><mat-icon role="img" svgicon="keyboard_arrow_right" class="mat-icon notranslate rotating-icon mat-icon-no-color" aria-hidden="true"><svg focusable="false" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><path d="M8.59 16.34l4.58-4.59-4.58-4.59L10 5.75l6 6-6 6z"></path></svg></mat-icon></button><div class="heading-children level-2 collapsed"><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-3 collapsed ng-star-inserted" style="position:relative" href="guide/upgrade" title="把 AngularJS 应用增量式的升级到 Angular。" target="_self"><span>升级步骤</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-3 collapsed ng-star-inserted" style="position:relative" href="guide/upgrade-performance" title="用更灵活的方式把 AngularJS 升级到 Angular。" target="_self"><span>更关注性能的升级方式</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-3 collapsed ng-star-inserted" style="position:relative" href="guide/ajs-quick-reference" title="学习如何把 AngularJS 的概念映射到 Angular 中。" target="_self"><span>AngularJS 与 Angular 的概念对照</span></a></div></aio-nav-item></div></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><button type="button" class="vertical-menu-item heading level-2 collapsed ng-star-inserted" title="使用共享库扩展 Angular" aria-pressed="false"><span>开发 Angular 库</span><mat-icon role="img" svgicon="keyboard_arrow_right" class="mat-icon notranslate rotating-icon mat-icon-no-color" aria-hidden="true"><svg focusable="false" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><path d="M8.59 16.34l4.58-4.59-4.58-4.59L10 5.75l6 6-6 6z"></path></svg></mat-icon></button><div class="heading-children level-2 collapsed"><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-3 collapsed ng-star-inserted" style="position:relative" href="guide/libraries" title="理解何时以及如何使用和创建库。" target="_self"><span>库概览</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-3 collapsed ng-star-inserted" style="position:relative" href="guide/using-libraries" title="把已发布的库集成进你的应用中。" target="_self"><span>使用已发布的库</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-3 collapsed ng-star-inserted" style="position:relative" href="guide/creating-libraries" title="通过创建、发布和使用你自己的库来扩展 Angular。" target="_self"><span>创建库</span></a></div></aio-nav-item></div></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><button type="button" class="vertical-menu-item heading level-2 collapsed ng-star-inserted" title="理解原理图" aria-pressed="false"><span>原理图（Schematic）</span><mat-icon role="img" svgicon="keyboard_arrow_right" class="mat-icon notranslate rotating-icon mat-icon-no-color" aria-hidden="true"><svg focusable="false" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><path d="M8.59 16.34l4.58-4.59-4.58-4.59L10 5.75l6 6-6 6z"></path></svg></mat-icon></button><div class="heading-children level-2 collapsed"><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-3 collapsed ng-star-inserted" style="position:relative" href="guide/schematics" title="理解 Angular 如何使用原理图。" target="_self"><span>原理图概览</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-3 collapsed ng-star-inserted" style="position:relative" href="guide/schematics-authoring" title="理解原理图的结构。" target="_self"><span>制作原理图</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-3 collapsed ng-star-inserted" style="position:relative" href="guide/schematics-for-libraries" title="使用原理图来把你的库集成进 Angular CLI 中。" target="_self"><span>库的原理图</span></a></div></aio-nav-item></div></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-2 collapsed ng-star-inserted" style="position:relative" href="guide/cli-builder" title="使用构建器定制 Angular CLI。" target="_self"><span>CLI 构建器</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-2 collapsed ng-star-inserted" style="position:relative" href="guide/web-worker" title="在 Angular CLI 中使用 Web Worker。" target="_self"><span>Web Worker</span></a></div></aio-nav-item></div></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><button type="button" class="vertical-menu-item heading level-1 collapsed ng-star-inserted" title="关于构建、测试和部署的信息" aria-pressed="false"><span>开发工作流</span><mat-icon role="img" svgicon="keyboard_arrow_right" class="mat-icon notranslate rotating-icon mat-icon-no-color" aria-hidden="true"><svg focusable="false" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><path d="M8.59 16.34l4.58-4.59-4.58-4.59L10 5.75l6 6-6 6z"></path></svg></mat-icon></button><div class="heading-children level-1 collapsed"><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><button type="button" class="vertical-menu-item heading level-2 collapsed ng-star-inserted" title="理解 AOT 预先编译器。" aria-pressed="false"><span>AOT 预先编译器</span><mat-icon role="img" svgicon="keyboard_arrow_right" class="mat-icon notranslate rotating-icon mat-icon-no-color" aria-hidden="true"><svg focusable="false" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><path d="M8.59 16.34l4.58-4.59-4.58-4.59L10 5.75l6 6-6 6z"></path></svg></mat-icon></button><div class="heading-children level-2 collapsed"><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-3 collapsed ng-star-inserted" style="position:relative" href="guide/aot-compiler" title="学习为何以及如何使用预先编译器。" target="_self"><span>预先编译</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-3 collapsed ng-star-inserted" style="position:relative" href="guide/angular-compiler-options" title="配置 AOT 编译。" target="_self"><span>Angular 编译器选项</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-3 collapsed ng-star-inserted" style="position:relative" href="guide/aot-metadata-errors" title="解决 AOT 编译错误。" target="_self"><span>AOT 元数据错误</span></a></div></aio-nav-item><aio-nav-item 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aria-pressed="false"><span>CLI 命令</span><mat-icon role="img" svgicon="keyboard_arrow_right" class="mat-icon notranslate rotating-icon mat-icon-no-color" aria-hidden="true"><svg focusable="false" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><path d="M8.59 16.34l4.58-4.59-4.58-4.59L10 5.75l6 6-6 6z"></path></svg></mat-icon></button><div class="heading-children level-1 collapsed"><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-2 collapsed ng-star-inserted" style="position:relative" href="cli" title="CLI 工具介绍、命令、语法" target="_self"><span>概览</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-2 collapsed ng-star-inserted" style="position:relative" href="cli/usage-analytics-gathering" title="管理员如何从用户那里收集使用情况分析。" target="_self"><span>使用情况分析</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-2 collapsed ng-star-inserted" style="position:relative" href="cli/add" title="ng add." target="_self"><span>ng add</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-2 collapsed ng-star-inserted" style="position:relative" href="cli/analytics" title="ng analytics." target="_self"><span>ng analytics</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-2 collapsed ng-star-inserted" style="position:relative" href="cli/build" title="ng build." target="_self"><span>ng build</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-2 collapsed ng-star-inserted" style="position:relative" href="cli/config" title="ng config." target="_self"><span>ng config</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-2 collapsed ng-star-inserted" style="position:relative" href="cli/deploy" title="ng deploy." target="_self"><span>ng deploy</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-2 collapsed ng-star-inserted" style="position:relative" href="cli/doc" title="ng doc." target="_self"><span>ng doc</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-2 collapsed ng-star-inserted" style="position:relative" href="cli/e2e" title="ng e2e." target="_self"><span>ng e2e</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-2 collapsed ng-star-inserted" style="position:relative" href="cli/generate" title="ng generate." target="_self"><span>ng generate</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-2 collapsed ng-star-inserted" style="position:relative" href="cli/help" title="ng help." target="_self"><span>ng help</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-2 collapsed ng-star-inserted" style="position:relative" href="cli/lint" title="ng lint." target="_self"><span>ng lint</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-2 collapsed ng-star-inserted" style="position:relative" href="cli/new" title="ng new." target="_self"><span>ng new</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-2 collapsed ng-star-inserted" style="position:relative" href="cli/run" title="ng run." target="_self"><span>ng run</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-2 collapsed ng-star-inserted" style="position:relative" href="cli/serve" title="ng serve." target="_self"><span>ng serve</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-2 collapsed ng-star-inserted" style="position:relative" href="cli/test" title="ng test." target="_self"><span>ng test</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-2 collapsed ng-star-inserted" style="position:relative" href="cli/update" title="ng update." target="_self"><span>ng update</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-2 collapsed ng-star-inserted" style="position:relative" href="cli/version" title="ng version." target="_self"><span>ng version</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-2 collapsed ng-star-inserted" style="position:relative" href="cli/xi18n" title="ng xi18n." target="_self"><span>ng xi18n</span></a></div></aio-nav-item></div></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-1 expanded selected ng-star-inserted" style="position:relative" href="api" title="关于 Angular 中类和值的详细信息。" target="_self"><span>API 参考手册</span></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><div class="mat-divider ng-star-inserted" style="margin:4px 20px;border-top:1px solid #d3d3d3"></div></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-1 collapsed ng-star-inserted" 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target="_blank"><span>ng-zorro 组件库</span><mat-icon role="img" class="mat-icon notranslate material-icons mat-icon-no-color ng-star-inserted" aria-hidden="true">open_in_new</mat-icon></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-1 collapsed ng-star-inserted" style="position:relative" href="https://devui.design/" title="“华为云” 开源的企业级组件库，核心设计思想是：致简、沉浸、灵活" target="_blank"><span>华为 DevUI 组件库</span><mat-icon role="img" class="mat-icon notranslate material-icons mat-icon-no-color ng-star-inserted" aria-hidden="true">open_in_new</mat-icon></a></div></aio-nav-item><aio-nav-item class="ng-star-inserted"><div class="ng-star-inserted"><a class="vertical-menu-item level-1 collapsed ng-star-inserted" style="position:relative" href="https://ng.mobile.ant.design/" title="Ant Design Mobile 的 Angular 实现，服务于无线产品。" target="_blank"><span>ng-zorro mobile 组件库</span><mat-icon role="img" class="mat-icon notranslate material-icons 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        }</script><a href="/api">API</a></div><div class="github-links"><a href="https://github.com/angular/angular-cn/edit/aio/packages/core/PACKAGE.md?message=docs(...)%3A%20请简述你的修改..." aria-label="提供编辑建议" title="提供编辑建议"><i class="material-icons" aria-hidden="true" role="img">mode_edit</i></a> <a href="https://github.com/angular/angular-cn/tree/9.0.0/packages/core/PACKAGE.md" aria-label="查看源码" title="查看源码"><i class="material-icons" aria-hidden="true" role="img">code</i></a></div></div><header class="api-header"><h1 id="angularcore">@angular/core<a title="Link to this heading" class="header-link" aria-hidden="true" href="api/core#angularcore"><i class="material-icons">link</i></a></h1><label class="api-type-label package">package</label></header><aio-toc class="embedded" ng-version="9.0.0-rc.11"><div class="toc-inner no-print collapsed ng-star-inserted"><button type="button" title="Expand/collapse contents" aria-label="Expand/collapse contents" class="toc-heading embedded secondary ng-star-inserted" aria-pressed="false">目录<mat-icon role="img" svgicon="keyboard_arrow_right" class="mat-icon notranslate rotating-icon collapsed mat-icon-no-color" aria-hidden="true"><svg focusable="false" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><path d="M8.59 16.34l4.58-4.59-4.58-4.59L10 5.75l6 6-6 6z"></path></svg></mat-icon></button><ul class="toc-list embedded"><li class="h2 ng-star-inserted" title="入口点"><a href="api/core#entry-points">入口点</a></li><li class="h3 ng-star-inserted" title="主要"><a href="api/core#primary">主要</a></li><li class="h3 ng-star-inserted" title="次要"><a href="api/core#secondary">次要</a></li><li class="h2 secondary ng-star-inserted" title="主入口点的导出"><a href="api/core#primary-entry-point-exports">主入口点的导出</a></li><li class="h3 secondary ng-star-inserted" title="模块"><a href="api/core#ngmodules">模块</a></li><li class="h3 secondary ng-star-inserted" title="类"><a href="api/core#classes">类</a></li><li class="h3 secondary ng-star-inserted" title="装饰器"><a href="api/core#decorators">装饰器</a></li><li class="h3 secondary ng-star-inserted" title="函数"><a href="api/core#functions">函数</a></li><li class="h3 secondary ng-star-inserted" title="结构"><a href="api/core#structures">结构</a></li><li class="h3 secondary ng-star-inserted" title="类型"><a href="api/core#types">类型</a></li></ul><button type="button" title="Expand/collapse contents" aria-label="Expand/collapse contents" class="toc-more-items embedded material-icons collapsed ng-star-inserted" aria-pressed="false"></button></div></aio-toc><div class="api-body"><p>Implements Angular's core functionality, low-level services, and utilities.</p><ul><li><p>Defines the class infrastructure for components, view hierarchies, change detection, rendering, and event handling.</p></li><li><p>Defines the decorators that supply metadata and context for Angular constructs.</p></li><li><p>Defines infrastructure for dependency injection (DI), internationalization (i18n), and various testing and debugging facilities.</p></li></ul><h2 id="entry-points">入口点<a title="Link to this heading" class="header-link" aria-hidden="true" href="api/core#entry-points"><i class="material-icons">link</i></a></h2><section class="export-list"><h3 id="primary">主要<a title="Link to this heading" class="header-link" aria-hidden="true" href="api/core#primary"><i class="material-icons">link</i></a></h3><table class="is-full-width list-table"><tbody><tr><td><code class="code-anchor"><a href="api/core#primary-entry-point-exports">@angular/core</a></code></td><td><p>Implements Angular's core functionality, low-level services, and utilities.</p></td></tr></tbody></table></section><section class="export-list"><h3 id="secondary">次要<a title="Link to this heading" class="header-link" aria-hidden="true" href="api/core#secondary"><i class="material-icons">link</i></a></h3><table class="is-full-width list-table"><tbody><tr><td><code class="code-anchor"><a href="api/core/global">@angular/core/global</a></code></td><td><p>Exposes a set of functions in the global namespace which are useful for debugging the current state of your application. These functions are exposed via the global <code>ng</code> "namespace" variable automatically when you import from <code>@angular/core</code> and run your application in development mode. These functions are not exposed when the application runs in a production mode.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/testing">@angular/core/testing</a></code></td><td><p>Provides infrastructure for testing Angular core functionality.</p></td></tr></tbody></table></section><h2 id="primary-entry-point-exports">主入口点的导出<a title="Link to this heading" class="header-link" aria-hidden="true" href="api/core#primary-entry-point-exports"><i class="material-icons">link</i></a></h2><section class="export-list"><h3 id="ngmodules">模块<a title="Link to this heading" class="header-link" aria-hidden="true" href="api/core#ngmodules"><i class="material-icons">link</i></a></h3><table class="is-full-width list-table"><tbody><tr><td><code class="code-anchor"><a href="api/core/ApplicationModule">ApplicationModule</a></code></td><td><p>Configures the root injector for an app with providers of <code>@angular/core</code> dependencies that <code><a href="api/core/ApplicationRef" class="code-anchor">ApplicationRef</a></code> needs to bootstrap components.</p></td></tr></tbody></table></section><section class="export-list"><h3 id="classes">类<a title="Link to this heading" class="header-link" aria-hidden="true" href="api/core#classes"><i class="material-icons">link</i></a></h3><table class="is-full-width list-table"><tbody><tr><td><code class="code-anchor"><a href="api/core/ApplicationInitStatus">ApplicationInitStatus</a></code></td><td><p>A class that reflects the state of running <a href="api/core/APP_INITIALIZER"><code>APP_INITIALIZER</code></a>s.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/ChangeDetectorRef">ChangeDetectorRef</a></code></td><td><p translation-result="on">Angular 各种视图的基础类，提供变更检测功能。 变更检测树会收集要检查的所有视图。 使用这些方法从树中添加或移除视图、初始化变更检测并显式地把这些视图标记为<em>脏的</em>，意思是它们变了、需要重新渲染。</p><p translation-origin="off">Base class for Angular Views, provides change detection functionality. A change-detection tree collects all views that are to be checked for changes. Use the methods to add and remove views from the tree, initiate change-detection, and explicitly mark views as <em>dirty</em>, meaning that they have changed and need to be rerendered.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/Compiler">Compiler</a></code></td><td><p>Low-level service for running the angular compiler during runtime to create <a href="api/core/ComponentFactory"><code>ComponentFactory</code></a>s, which can later be used to create and render a Component instance.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/CompilerFactory">CompilerFactory</a></code></td><td><p>A factory for creating a Compiler</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/ComponentFactory">ComponentFactory</a></code></td><td><p>Base class for a factory that can create a component dynamically. Instantiate a factory for a given type of component with <code><a href="" class="code-anchor">resolveComponentFactory()</a></code>. Use the resulting <code>ComponentFactory.create()</code> method to create a component of that type.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/ComponentFactoryResolver">ComponentFactoryResolver</a></code></td><td><p>A simple registry that maps <code>Components</code> to generated <code><a href="api/core/ComponentFactory" class="code-anchor">ComponentFactory</a></code> classes that can be used to create instances of components. Use to obtain the factory for a given component type, then use the factory's <code>create()</code> method to create a component of that type.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/ComponentRef">ComponentRef</a></code></td><td><p>Represents a component created by a <code><a href="api/core/ComponentFactory" class="code-anchor">ComponentFactory</a></code>. Provides access to the component instance and related objects, and provides the means of destroying the instance.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/DebugEventListener">DebugEventListener</a></code></td><td></td></tr><tr><td><code class="code-anchor deprecated-api-item"><a href="api/core/DefaultIterableDiffer" class="deprecated-api-item">DefaultIterableDiffer</a></code></td><td><p><strong>已废弃:</strong> v4.0.0 - Should not be part of public API.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/ElementRef">ElementRef</a></code></td><td><p translation-result="on">对视图中某个原生元素的包装器。</p><p translation-origin="off">A wrapper around a native element inside of a View.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/EmbeddedViewRef">EmbeddedViewRef</a></code></td><td><p>Represents an Angular <a href="guide/glossary#view">view</a> in a view container. An <a href="guide/glossary#view-tree">embedded view</a> can be referenced from a component other than the hosting component whose template defines it, or it can be defined independently by a <code><a href="api/core/TemplateRef" class="code-anchor">TemplateRef</a></code>.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/ErrorHandler">ErrorHandler</a></code></td><td><p>Provides a hook for centralized exception handling.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/EventEmitter">EventEmitter</a></code></td><td><p>Use in components with the <code>@<a href="api/core/Output" class="code-anchor">Output</a></code> directive to emit custom events synchronously or asynchronously, and register handlers for those events by subscribing to an instance.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/InjectionToken">InjectionToken</a></code></td><td><p>Creates a token that can be used in a DI Provider.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/Injector">Injector</a></code></td><td><p>Concrete injectors implement this interface. Injectors are configured with <a href="guide/glossary#provider">providers</a> that associate dependencies of various types with <a href="guide/glossary#di-token">injection tokens</a>.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/IterableDiffers">IterableDiffers</a></code></td><td><p>A repository of different iterable diffing strategies used by NgFor, NgClass, and others.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/KeyValueDiffers">KeyValueDiffers</a></code></td><td><p>A repository of different Map diffing strategies used by NgClass, NgStyle, and others.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/ModuleWithComponentFactories">ModuleWithComponentFactories</a></code></td><td><p>Combination of NgModuleFactory and ComponentFactorys.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/NgModuleFactory">NgModuleFactory</a></code></td><td></td></tr><tr><td><code class="code-anchor deprecated-api-item"><a href="api/core/NgModuleFactoryLoader" class="deprecated-api-item">NgModuleFactoryLoader</a></code></td><td><p><strong>已废弃:</strong> the <code>string</code> form of <code><a href="api/router/Route#loadChildren" class="code-anchor">loadChildren</a></code> is deprecated, and <code><a href="api/core/NgModuleFactoryLoader" class="code-anchor">NgModuleFactoryLoader</a></code> is part of its implementation. See <code><a href="api/router/LoadChildren" class="code-anchor">LoadChildren</a></code> for more details.</p><p>Used to load ng module factories.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/NgModuleRef">NgModuleRef</a></code></td><td><p>Represents an instance of an NgModule created via a <a href="api/core/NgModuleFactory"><code>NgModuleFactory</code></a>.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/NgProbeToken">NgProbeToken</a></code></td><td><p>A token for third-party components that can register themselves with NgProbe.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/NgZone">NgZone</a></code></td><td><p>An injectable service for executing work inside or outside of the Angular zone.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/Query">Query</a></code></td><td><p>Base class for query metadata.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/QueryList">QueryList</a></code></td><td><p translation-result="on">一个不可修改的条目列表，当应用状态变化时，Angular 会保证它是最新的。</p><p translation-origin="off">An unmodifiable list of items that Angular keeps up to date when the state of the application changes.</p></td></tr><tr><td><code class="code-anchor deprecated-api-item"><a href="api/core/ReflectiveInjector" class="deprecated-api-item">ReflectiveInjector</a></code></td><td><p><strong>已废弃:</strong> from v5 - slow and brings in a lot of code, Use <code>Injector.create</code> instead.</p><p>A ReflectiveDependency injection container used for instantiating objects and resolving dependencies.</p></td></tr><tr><td><code class="code-anchor deprecated-api-item"><a href="api/core/ReflectiveKey" class="deprecated-api-item">ReflectiveKey</a></code></td><td><p><strong>已废弃:</strong> No replacement</p><p>A unique object used for retrieving items from the <a href="api/core/ReflectiveInjector"><code>ReflectiveInjector</code></a>.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/Renderer2">Renderer2</a></code></td><td><p translation-result="on">扩展此基类以实现自定义渲染器。默认情况下，Angular 会把模板渲染成 DOM。 你可以使用自定义渲染器来拦截渲染类调用，或用于渲染一些非 DOM 的东西。</p><p translation-origin="off">Extend this base class to implement custom rendering. By default, Angular renders a template into DOM. You can use custom rendering to intercept rendering calls, or to render to something other than DOM.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/RendererFactory2">RendererFactory2</a></code></td><td><p>Creates and initializes a custom renderer that implements the <code><a href="api/core/Renderer2" class="code-anchor">Renderer2</a></code> base class.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/ResolvedReflectiveFactory">ResolvedReflectiveFactory</a></code></td><td><p>An internal resolved representation of a factory function created by resolving <code><a href="api/core/Provider" class="code-anchor">Provider</a></code>.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/Sanitizer">Sanitizer</a></code></td><td><p>Sanitizer is used by the views to sanitize potentially dangerous values.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/SimpleChange">SimpleChange</a></code></td><td><p>Represents a basic change from a previous to a new value for a single property on a directive instance. Passed as a value in a <a href="api/core/SimpleChanges"><code>SimpleChanges</code></a>object to the <code>ngOnChanges</code> hook.</p></td></tr><tr><td><code class="code-anchor deprecated-api-item"><a href="api/core/SystemJsNgModuleLoader" class="deprecated-api-item">SystemJsNgModuleLoader</a></code></td><td><p><strong>已废弃:</strong> the <code>string</code> form of <code><a href="api/router/Route#loadChildren" class="code-anchor">loadChildren</a></code> is deprecated, and <code><a href="api/core/SystemJsNgModuleLoader" class="code-anchor">SystemJsNgModuleLoader</a></code> is part of its implementation. See <code><a href="api/router/LoadChildren" class="code-anchor">LoadChildren</a></code> for more details.</p><p>NgModuleFactoryLoader that uses SystemJS to load NgModuleFactory</p></td></tr><tr><td><code class="code-anchor deprecated-api-item"><a href="api/core/SystemJsNgModuleLoaderConfig" class="deprecated-api-item">SystemJsNgModuleLoaderConfig</a></code></td><td><p><strong>已废弃:</strong> the <code>string</code> form of <code><a href="api/router/Route#loadChildren" class="code-anchor">loadChildren</a></code> is deprecated, and <code><a href="api/core/SystemJsNgModuleLoaderConfig" class="code-anchor">SystemJsNgModuleLoaderConfig</a></code> is part of its implementation. See <code><a href="api/router/LoadChildren" class="code-anchor">LoadChildren</a></code> for more details.</p><p>Configuration for SystemJsNgModuleLoader. token.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/TemplateRef">TemplateRef</a></code></td><td><p translation-result="on">表示一个内嵌模板，它可用于实例化内嵌的视图。 要想根据模板实例化内嵌的视图，请使用 <code><a href="api/core/ViewContainerRef" class="code-anchor">ViewContainerRef</a></code> 的 <code>createEmbeddedView()</code> 方法。</p><p translation-origin="off">Represents an embedded template that can be used to instantiate embedded views. To instantiate embedded views based on a template, use the <code><a href="api/core/ViewContainerRef" class="code-anchor">ViewContainerRef</a></code> method <code>createEmbeddedView()</code>.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/Testability">Testability</a></code></td><td><p>The Testability service provides testing hooks that can be accessed from the browser and by services such as Protractor. Each bootstrapped Angular application on the page will have an instance of Testability.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/TestabilityRegistry">TestabilityRegistry</a></code></td><td><p>A global registry of <a href="api/core/Testability"><code>Testability</code></a>instances for specific elements.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/Version">Version</a></code></td><td><p>Represents the version of Angular</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/ViewContainerRef">ViewContainerRef</a></code></td><td><p translation-result="on">表示可以将一个或多个视图附着到组件中的容器。</p><p translation-origin="off">Represents a container where one or more views can be attached to a component.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/ViewRef">ViewRef</a></code></td><td><p>Represents an Angular <a href="guide/glossary#view">view</a>, specifically the <a href="guide/glossary#view-tree">host view</a> that is defined by a component. Also serves as the base class that adds destroy methods for <a href="guide/glossary#view-tree">embedded views</a>.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/WrappedValue">WrappedValue</a></code></td><td><p translation-result="on">表示 <a href="api/core/Pipe"><code>Pipe</code></a>转换的值已经变化了 —— 即使其引用并没有变。</p><p translation-origin="off">Indicates that the result of a <a href="api/core/Pipe"><code>Pipe</code></a>transformation has changed even though the reference has not changed.</p></td></tr></tbody></table></section><section class="export-list"><h3 id="decorators">装饰器<a title="Link to this heading" class="header-link" aria-hidden="true" href="api/core#decorators"><i class="material-icons">link</i></a></h3><table class="is-full-width list-table"><tbody><tr><td><code class="code-anchor"><a href="api/core/Attribute">Attribute</a></code></td><td><p>Parameter decorator for a directive constructor that designates a host-element attribute whose value is injected as a constant string literal.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/Component">Component</a></code></td><td><p translation-result="on">一个装饰器，用于把某个类标记为 Angular 组件，并为它配置一些元数据，以决定该组件在运行期间该如何处理、实例化和使用。</p><p translation-origin="off">Decorator that marks a class as an Angular component and provides configuration metadata that determines how the component should be processed, instantiated, and used at runtime.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/ContentChild">ContentChild</a></code></td><td><p>Parameter decorator that configures a content query.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/ContentChildren">ContentChildren</a></code></td><td><p>Parameter decorator that configures a content query.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/Directive">Directive</a></code></td><td><p>Decorator that marks a class as an Angular directive. You can define your own directives to attach custom behavior to elements in the DOM.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/Host">Host</a></code></td><td><p>Parameter decorator on a view-provider parameter of a class constructor that tells the DI framework to resolve the view by checking injectors of child elements, and stop when reaching the host element of the current component.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/HostBinding">HostBinding</a></code></td><td><p translation-result="on">一个装饰器，用于把一个 DOM 属性标记为绑定到宿主的属性，并提供配置元数据。 Angular 在变更检测期间会自动检查宿主属性绑定，如果这个绑定变化了，它就会更新该指令所在的宿主元素。</p><p translation-origin="off">Decorator that marks a DOM property as a host-binding property and supplies configuration metadata. Angular automatically checks host property bindings during change detection, and if a binding changes it updates the host element of the directive.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/HostListener">HostListener</a></code></td><td><p>Decorator that declares a DOM event to listen for, and provides a handler method to run when that event occurs.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/Inject">Inject</a></code></td><td><p>Parameter decorator on a dependency parameter of a class constructor that specifies a custom provider of the dependency.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/Injectable">Injectable</a></code></td><td><p translation-result="on">标记性元数据，表示一个类可以由 <code><a href="api/core/Injector" class="code-anchor">Injector</a></code> 进行创建。</p><p translation-origin="off">Decorator that marks a class as available to be provided and injected as a dependency.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/Input">Input</a></code></td><td><p translation-result="on">一个装饰器，用来把某个类字段标记为输入属性，并提供配置元数据。 该输入属性会绑定到模板中的某个 DOM 属性。当变更检测时，Angular 会自动使用这个 DOM 属性的值来更新此数据属性。</p><p translation-origin="off">Decorator that marks a class field as an input property and supplies configuration metadata. The input property is bound to a DOM property in the template. During change detection, Angular automatically updates the data property with the DOM property's value.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/NgModule">NgModule</a></code></td><td><p translation-result="on">把一个类标记为 NgModule，并提供配置元数据。</p><p translation-origin="off">Decorator that marks a class as an NgModule and supplies configuration metadata.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/Optional">Optional</a></code></td><td><p>Parameter decorator to be used on constructor parameters, which marks the parameter as being an optional dependency. The DI framework provides null if the dependency is not found.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/Output">Output</a></code></td><td><p translation-result="on">一个装饰器，用于把一个类字段标记为输出属性，并提供配置元数据。 凡是绑定到输出属性上的 DOM 属性，Angular 在变更检测期间都会自动进行更新。</p><p translation-origin="off">Decorator that marks a class field as an output property and supplies configuration metadata. The DOM property bound to the output property is automatically updated during change detection.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/Pipe">Pipe</a></code></td><td><p>Decorator that marks a class as pipe and supplies configuration metadata.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/Self">Self</a></code></td><td><p>Parameter decorator to be used on constructor parameters, which tells the DI framework to start dependency resolution from the local injector.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/SkipSelf">SkipSelf</a></code></td><td><p>Parameter decorator to be used on constructor parameters, which tells the DI framework to start dependency resolution from the parent injector. Resolution works upward through the injector hierarchy, so the local injector is not checked for a provider.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/ViewChild">ViewChild</a></code></td><td><p translation-result="on">属性装饰器，用于配置一个视图查询。 变更检测器会在视图的 DOM 中查找能匹配上该选择器的第一个元素或指令。 如果视图的 DOM 发生了变化，出现了匹配该选择器的新的子节点，该属性就会被更新。</p><p translation-origin="off">Property decorator that configures a view query. The change detector looks for the first element or the directive matching the selector in the view DOM. If the view DOM changes, and a new child matches the selector, the property is updated.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/ViewChildren">ViewChildren</a></code></td><td><p>Parameter decorator that configures a view query.</p></td></tr></tbody></table></section><section class="export-list"><h3 id="functions">函数<a title="Link to this heading" class="header-link" aria-hidden="true" href="api/core#functions"><i class="material-icons">link</i></a></h3><table class="is-full-width list-table"><tbody><tr><td><code class="code-anchor"><a href="api/core/asNativeElements">asNativeElements</a></code></td><td></td></tr><tr><td><code class="code-anchor"><a href="api/core/assertPlatform">assertPlatform</a></code></td><td><p>Checks that there currently is a platform which contains the given token as a provider.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/createPlatform">createPlatform</a></code></td><td><p>Creates a platform. Platforms have to be eagerly created via this function.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/createPlatformFactory">createPlatformFactory</a></code></td><td><p>Creates a factory for a platform</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/destroyPlatform">destroyPlatform</a></code></td><td><p>Destroy the existing platform.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/enableProdMode">enableProdMode</a></code></td><td><p>Disable Angular's development mode, which turns off assertions and other checks within the framework.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/forwardRef">forwardRef</a></code></td><td><p>Allows to refer to references which are not yet defined.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/getPlatform">getPlatform</a></code></td><td><p>Returns the current platform.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/isDevMode">isDevMode</a></code></td><td><p>Returns whether Angular is in development mode. After called once, the value is locked and won't change any more.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/resolveForwardRef">resolveForwardRef</a></code></td><td><p>Lazily retrieves the reference value from a forwardRef.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/setTestabilityGetter">setTestabilityGetter</a></code></td><td><p>Set the <a href="api/core/GetTestability"><code>GetTestability</code></a>implementation used by the Angular testing framework.</p></td></tr></tbody></table></section><section class="export-list"><h3 id="structures">结构<a title="Link to this heading" class="header-link" aria-hidden="true" href="api/core#structures"><i class="material-icons">link</i></a></h3><table class="is-full-width list-table"><tbody><tr><td><code class="code-anchor"><a href="api/core/AbstractType">AbstractType</a></code></td><td><p>Represents an abstract class <code>T</code>, if applied to a concrete class it would stop being instantiatable.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/AfterContentChecked">AfterContentChecked</a></code></td><td><p translation-result="on">一个生命周期钩子，它会在默认的变更检测器对指令的所有内容完成了变更检查之后调用。</p><p translation-origin="off">A lifecycle hook that is called after the default change detector has completed checking all content of a directive.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/AfterContentInit">AfterContentInit</a></code></td><td><p translation-result="on">一个生命周期钩子，它会在 Angular 完全实例化了指令的所有内容之后调用。 定义一个 <code><a href="api/router/RouterLinkActive#ngAfterContentInit" class="code-anchor">ngAfterContentInit()</a></code> 方法来处理额外的初始化任务。</p><p translation-origin="off">A lifecycle hook that is called after Angular has fully initialized all content of a directive. Define an <code><a href="api/router/RouterLinkActive#ngAfterContentInit" class="code-anchor">ngAfterContentInit()</a></code> method to handle any additional initialization tasks.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/AfterViewChecked">AfterViewChecked</a></code></td><td><p translation-result="on">一个生命周期钩子，它会在默认的变更检测器完成了对组件视图的变更检测之后调用。</p><p translation-origin="off">A lifecycle hook that is called after the default change detector has completed checking a component's view for changes.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/AfterViewInit">AfterViewInit</a></code></td><td><p translation-result="on">一个生命周期钩子，会在 Angular 完全初始化了组件的视图后调用。 定义一个 <code><a href="api/forms/NgForm#ngAfterViewInit" class="code-anchor">ngAfterViewInit()</a></code> 方法来处理一些额外的初始化任务。</p><p translation-origin="off">A lifecycle hook that is called after Angular has fully initialized a component's view. Define an <code><a href="api/forms/NgForm#ngAfterViewInit" class="code-anchor">ngAfterViewInit()</a></code> method to handle any additional initialization tasks.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/ApplicationRef">ApplicationRef</a></code></td><td><p>A reference to an Angular application running on a page.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/ChangeDetectionStrategy">ChangeDetectionStrategy</a></code></td><td><p>The strategy that the default change detector uses to detect changes. When set, takes effect the next time change detection is triggered.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/ClassProvider">ClassProvider</a></code></td><td><p>Configures the <code><a href="api/core/Injector" class="code-anchor">Injector</a></code> to return an instance of <code>useClass</code> for a token.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/ClassSansProvider">ClassSansProvider</a></code></td><td><p>Configures the <code><a href="api/core/Injector" class="code-anchor">Injector</a></code> to return a value by invoking a <code>useClass</code> function. Base for <code><a href="api/core/ClassProvider" class="code-anchor">ClassProvider</a></code> decorator.</p></td></tr><tr><td><code class="code-anchor deprecated-api-item"><a href="api/core/CollectionChangeRecord" class="deprecated-api-item">CollectionChangeRecord</a></code></td><td><p><strong>已废弃:</strong> v4.0.0 - Use IterableChangeRecord instead.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/ConstructorProvider">ConstructorProvider</a></code></td><td><p>Configures the <code><a href="api/core/Injector" class="code-anchor">Injector</a></code> to return an instance of a token.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/ConstructorSansProvider">ConstructorSansProvider</a></code></td><td><p>Configures the <code><a href="api/core/Injector" class="code-anchor">Injector</a></code> to return an instance of a token.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/DebugElement">DebugElement</a></code></td><td></td></tr><tr><td><code class="code-anchor"><a href="api/core/DebugNode">DebugNode</a></code></td><td></td></tr><tr><td><code class="code-anchor"><a href="api/core/DoBootstrap">DoBootstrap</a></code></td><td><p>Hook for manual bootstrapping of the application instead of using bootstrap array in @NgModule annotation.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/DoCheck">DoCheck</a></code></td><td><p translation-result="on">一个生命周期钩子，除了使用默认的变更检查器执行检查之外，还会为指令执行自定义的变更检测函数。</p><p translation-origin="off">A lifecycle hook that invokes a custom change-detection function for a directive, in addition to the check performed by the default change-detector.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/ExistingProvider">ExistingProvider</a></code></td><td><p>Configures the <code><a href="api/core/Injector" class="code-anchor">Injector</a></code> to return a value of another <code><a href="api/core/ExistingSansProvider#useExisting" class="code-anchor">useExisting</a></code> token.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/ExistingSansProvider">ExistingSansProvider</a></code></td><td><p>Configures the <code><a href="api/core/Injector" class="code-anchor">Injector</a></code> to return a value of another <code><a href="api/core/ExistingSansProvider#useExisting" class="code-anchor">useExisting</a></code> token.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/FactoryProvider">FactoryProvider</a></code></td><td><p>Configures the <code><a href="api/core/Injector" class="code-anchor">Injector</a></code> to return a value by invoking a <code><a href="api/core/FactorySansProvider#useFactory" class="code-anchor">useFactory</a></code> function.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/FactorySansProvider">FactorySansProvider</a></code></td><td><p>Configures the <code><a href="api/core/Injector" class="code-anchor">Injector</a></code> to return a value by invoking a <code><a href="api/core/FactorySansProvider#useFactory" class="code-anchor">useFactory</a></code> function.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/ForwardRefFn">ForwardRefFn</a></code></td><td><p>An interface that a function passed into <a href="api/core/forwardRef"><code>forwardRef</code></a>has to implement.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/GetTestability">GetTestability</a></code></td><td><p>Adapter interface for retrieving the <code><a href="api/core/Testability" class="code-anchor">Testability</a></code> service associated for a particular context.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/InjectFlags">InjectFlags</a></code></td><td><p>Injection flags for DI.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/InjectableType">InjectableType</a></code></td><td><p>A <code><a href="api/core/Type" class="code-anchor">Type</a></code> which has an <code>InjectableDef</code> static field.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/InjectorType">InjectorType</a></code></td><td><p>A type which has an <code>InjectorDef</code> static field.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/IterableChangeRecord">IterableChangeRecord</a></code></td><td><p>Record representing the item change information.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/IterableChanges">IterableChanges</a></code></td><td><p>An object describing the changes in the <code>Iterable</code> collection since last time <code><a href="api/core/IterableDiffer" class="code-anchor">IterableDiffer</a>#diff()</code> was invoked.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/IterableDiffer">IterableDiffer</a></code></td><td><p>A strategy for tracking changes over time to an iterable. Used by <a href="api/common/NgForOf"><code>NgForOf</code></a>to respond to changes in an iterable by effecting equivalent changes in the DOM.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/IterableDifferFactory">IterableDifferFactory</a></code></td><td><p>Provides a factory for <a href="api/core/IterableDiffer"><code>IterableDiffer</code></a>.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/KeyValueChangeRecord">KeyValueChangeRecord</a></code></td><td><p>Record representing the item change information.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/KeyValueChanges">KeyValueChanges</a></code></td><td><p>An object describing the changes in the <code>Map</code> or <code>{[k:string]: string}</code> since last time <code><a href="api/core/KeyValueDiffer" class="code-anchor">KeyValueDiffer</a>#diff()</code> was invoked.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/KeyValueDiffer">KeyValueDiffer</a></code></td><td><p>A differ that tracks changes made to an object over time.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/KeyValueDifferFactory">KeyValueDifferFactory</a></code></td><td><p>Provides a factory for <a href="api/core/KeyValueDiffer"><code>KeyValueDiffer</code></a>.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/MissingTranslationStrategy">MissingTranslationStrategy</a></code></td><td><p>Use this enum at bootstrap as an option of <code>bootstrapModule</code> to define the strategy that the compiler should use in case of missing translations:</p><ul><li>Error: throw if you have missing translations.</li><li>Warning (default): show a warning in the console and/or shell.</li><li>Ignore: do nothing.</li></ul></td></tr><tr><td><code class="code-anchor"><a href="api/core/ModuleWithProviders">ModuleWithProviders</a></code></td><td><p translation-result="on">对 NgModule 及其相关 providers 的包装。</p><p translation-origin="off">A wrapper around an NgModule that associates it with the providers.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/OnChanges">OnChanges</a></code></td><td><p translation-result="on">一个生命周期钩子，当指令的任何一个可绑定属性发生变化时调用。 定义一个 <code>ngOnChanges()</code> 方法来处理这些变更。</p><p translation-origin="off">A lifecycle hook that is called when any data-bound property of a directive changes. Define an <code>ngOnChanges()</code> method to handle the changes.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/OnDestroy">OnDestroy</a></code></td><td><p translation-result="on">一个生命周期钩子，它会在指令、管道或服务被销毁时调用。 用于在实例被销毁时，执行一些自定义清理代码。</p><p translation-origin="off">A lifecycle hook that is called when a directive, pipe, or service is destroyed. Use for any custom cleanup that needs to occur when the instance is destroyed.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/OnInit">OnInit</a></code></td><td><p translation-result="on">一个生命周期钩子，它会在 Angular 初始化完了该指令的所有数据绑定属性之后调用。 定义 <code>ngOnInit()</code> 方法可以处理所有附加的初始化任务。</p><p translation-origin="off">A lifecycle hook that is called after Angular has initialized all data-bound properties of a directive. Define an <code>ngOnInit()</code> method to handle any additional initialization tasks.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/PipeTransform">PipeTransform</a></code></td><td><p translation-result="on">一个需要由管道实现的接口，用于执行转换操作。 Angular 会调用它的 <code>transform</code> 方法，并把要绑定的值作为第一个参数传入，其它参数会依次从第二个参数的位置开始传入。</p><p translation-origin="off">An interface that is implemented by pipes in order to perform a transformation. Angular invokes the <code>transform</code> method with the value of a binding as the first argument, and any parameters as the second argument in list form.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/PlatformRef">PlatformRef</a></code></td><td><p>The Angular platform is the entry point for Angular on a web page. Each page has exactly one platform, and services (such as reflection) which are common to every Angular application running on the page are bound in its scope.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/Predicate">Predicate</a></code></td><td><p>A boolean-valued function over a value, possibly including context information regarding that value's position in an array.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/RendererStyleFlags2">RendererStyleFlags2</a></code></td><td><p>Flags for renderer-specific style modifiers.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/RendererType2">RendererType2</a></code></td><td><p>Used by <code><a href="api/core/RendererFactory2" class="code-anchor">RendererFactory2</a></code> to associate custom rendering data and styles with a rendering implementation.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/ResolvedReflectiveProvider">ResolvedReflectiveProvider</a></code></td><td><p>An internal resolved representation of a <code><a href="api/core/Provider" class="code-anchor">Provider</a></code> used by the <code><a href="api/core/Injector" class="code-anchor">Injector</a></code>.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/SchemaMetadata">SchemaMetadata</a></code></td><td><p>A schema definition associated with an NgModule.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/SecurityContext">SecurityContext</a></code></td><td><p>A SecurityContext marks a location that has dangerous security implications, e.g. a DOM property like <code>innerHTML</code> that could cause Cross Site Scripting (XSS) security bugs when improperly handled.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/SimpleChanges">SimpleChanges</a></code></td><td><p>A hashtable of changes represented by <a href="api/core/SimpleChange"><code>SimpleChange</code></a>objects stored at the declared property name they belong to on a Directive or Component. This is the type passed to the <code>ngOnChanges</code> hook.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/StaticClassProvider">StaticClassProvider</a></code></td><td><p>Configures the <code><a href="api/core/Injector" class="code-anchor">Injector</a></code> to return an instance of <code>useClass</code> for a token.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/StaticClassSansProvider">StaticClassSansProvider</a></code></td><td><p>Configures the <code><a href="api/core/Injector" class="code-anchor">Injector</a></code> to return an instance of <code>useClass</code> for a token. Base for <code><a href="api/core/StaticClassProvider" class="code-anchor">StaticClassProvider</a></code> decorator.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/TrackByFunction">TrackByFunction</a></code></td><td><p>An optional function passed into the <code><a href="api/common/NgForOf" class="code-anchor">NgForOf</a></code> directive that defines how to track changes for items in an iterable. The function takes the iteration index and item ID. When supplied, Angular tracks changes by the return value of the function.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/Type">Type</a></code></td><td><p>Represents a type that a Component or other object is instances of.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/TypeDecorator">TypeDecorator</a></code></td><td><p>An interface implemented by all Angular type decorators, which allows them to be used as decorators as well as Angular syntax.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/TypeProvider">TypeProvider</a></code></td><td><p>Configures the <code><a href="api/core/Injector" class="code-anchor">Injector</a></code> to return an instance of <code><a href="api/core/Type" class="code-anchor">Type</a></code> when `Type' is used as the token.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/ValueProvider">ValueProvider</a></code></td><td><p>Configures the <code><a href="api/core/Injector" class="code-anchor">Injector</a></code> to return a value for a token.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/ValueSansProvider">ValueSansProvider</a></code></td><td><p>Configures the <code><a href="api/core/Injector" class="code-anchor">Injector</a></code> to return a value for a token. Base for <code><a href="api/core/ValueProvider" class="code-anchor">ValueProvider</a></code> decorator.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/ViewEncapsulation">ViewEncapsulation</a></code></td><td><p>Defines template and style encapsulation options available for Component's <a href="api/core/Component"><code>Component</code></a>.</p></td></tr></tbody></table></section><section class="export-list"><h3 id="types">类型<a title="Link to this heading" class="header-link" aria-hidden="true" href="api/core#types"><i class="material-icons">link</i></a></h3><table class="is-full-width list-table"><tbody><tr><td><code class="code-anchor deprecated-api-item"><a href="api/core/ANALYZE_FOR_ENTRY_COMPONENTS" class="deprecated-api-item">ANALYZE_FOR_ENTRY_COMPONENTS</a></code></td><td><p><strong>已废弃:</strong> Since 9.0.0. With Ivy, this property is no longer necessary.</p><p>A DI token that you can use to create a virtual <a href="guide/glossary#provider">provider</a> that will populate the <code>entryComponents</code> field of components and NgModules based on its <code><a href="api/core/ValueSansProvider#useValue" class="code-anchor">useValue</a></code> property value. All components that are referenced in the <code><a href="api/core/ValueSansProvider#useValue" class="code-anchor">useValue</a></code> value (either directly or in a nested array or map) are added to the <code>entryComponents</code> property.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/APP_BOOTSTRAP_LISTENER">APP_BOOTSTRAP_LISTENER</a></code></td><td><p>All callbacks provided via this token will be called for every component that is bootstrapped. Signature of the callback:</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/APP_ID">APP_ID</a></code></td><td><p>A DI Token representing a unique string id assigned to the application by Angular and used primarily for prefixing application attributes and CSS styles when <a href="api/core/ViewEncapsulation#Emulated">ViewEncapsulation.Emulated</a> is being used.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/APP_INITIALIZER">APP_INITIALIZER</a></code></td><td><p>An injection token that allows you to provide one or more initialization functions. These function are injected at application startup and executed during app initialization. If any of these functions returns a Promise, initialization does not complete until the Promise is resolved.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/COMPILER_OPTIONS">COMPILER_OPTIONS</a></code></td><td><p>Token to provide CompilerOptions in the platform injector.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/CUSTOM_ELEMENTS_SCHEMA">CUSTOM_ELEMENTS_SCHEMA</a></code></td><td><p>Defines a schema that allows an NgModule to contain the following:</p><ul><li>Non-Angular elements named with dash case (<code>-</code>).</li><li>Element properties named with dash case (<code>-</code>). Dash case is the naming convention for custom elements.</li></ul></td></tr><tr><td><code class="code-anchor"><a href="api/core/CompilerOptions">CompilerOptions</a></code></td><td><p>Options for creating a compiler</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/DEFAULT_CURRENCY_CODE">DEFAULT_CURRENCY_CODE</a></code></td><td><p>Provide this token to set the default currency code your application uses for CurrencyPipe when there is no currency code passed into it. This is only used by CurrencyPipe and has no relation to locale currency. Defaults to USD if not configured.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/INJECTOR">INJECTOR</a></code></td><td><p>An InjectionToken that gets the current <code><a href="api/core/Injector" class="code-anchor">Injector</a></code> for <code>createInjector()</code>-style injectors.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/InjectableProvider">InjectableProvider</a></code></td><td><p translation-result="on"><code>@<a href="api/core/Injectable" class="code-anchor">Injectable</a></code> 装饰器中使用的可注入对象提供商。</p><p translation-origin="off">Injectable providers used in <code>@<a href="api/core/Injectable" class="code-anchor">Injectable</a></code> decorator.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/LOCALE_ID">LOCALE_ID</a></code></td><td><p>Provide this token to set the locale of your application. It is used for i18n extraction, by i18n pipes (DatePipe, I18nPluralPipe, CurrencyPipe, DecimalPipe and PercentPipe) and by ICU expressions.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/NO_ERRORS_SCHEMA">NO_ERRORS_SCHEMA</a></code></td><td><p>Defines a schema that allows any property on any element.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/NgIterable">NgIterable</a></code></td><td><p>A type describing supported iterable types.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/PACKAGE_ROOT_URL">PACKAGE_ROOT_URL</a></code></td><td><p>A token which indicates the root directory of the application</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/PLATFORM_ID">PLATFORM_ID</a></code></td><td><p>A token that indicates an opaque platform id.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/PLATFORM_INITIALIZER">PLATFORM_INITIALIZER</a></code></td><td><p>A function that will be executed when a platform is initialized.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/Provider">Provider</a></code></td><td><p>Describes how the <code><a href="api/core/Injector" class="code-anchor">Injector</a></code> should be configured.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/StaticProvider">StaticProvider</a></code></td><td><p>Describes how an <code><a href="api/core/Injector" class="code-anchor">Injector</a></code> should be configured as static (that is, without reflection). A static provider provides tokens to an injector for various types of dependencies.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/TRANSLATIONS">TRANSLATIONS</a></code></td><td><p>Use this token at bootstrap to provide the content of your translation file (<code>xtb</code>, <code>xlf</code> or <code>xlf2</code>) when you want to translate your application in another language.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/TRANSLATIONS_FORMAT">TRANSLATIONS_FORMAT</a></code></td><td><p>Provide this token at bootstrap to set the format of your <a href="api/core/TRANSLATIONS"><code>TRANSLATIONS</code></a>: <code>xtb</code>, <code>xlf</code> or <code>xlf2</code>.</p></td></tr><tr><td><code class="code-anchor deprecated-api-item"><a href="api/core/defineInjectable" class="deprecated-api-item">defineInjectable</a></code></td><td><p><strong>已废弃:</strong> in v8, delete after v10. This API should be used only be generated code, and that code should now use ɵɵdefineInjectable instead.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/getDebugNode">getDebugNode</a></code></td><td></td></tr><tr><td><code class="code-anchor"><a href="api/core/getModuleFactory">getModuleFactory</a></code></td><td><p>Returns the NgModuleFactory with the given id, if it exists and has been loaded. Factories for modules that do not specify an <code>id</code> cannot be retrieved. Throws if the module cannot be found.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/inject">inject</a></code></td><td><p>Injects a token from the currently active injector.</p></td></tr><tr><td><code class="code-anchor"><a href="api/core/platformCore">platformCore</a></code></td><td><p>This platform has to be included in any other platform</p></td></tr></tbody></table></section></div></article></div></aio-doc-viewer></main></mat-sidenav-content></mat-sidenav-container><div class="toc-container no-print ng-star-inserted"><aio-lazy-ce selector="aio-toc"><aio-toc ng-version="9.0.0-rc.11"><div class="toc-inner no-print collapsed ng-star-inserted"><ul class="toc-list"><li class="h1 ng-star-inserted active" title="@angular/core"><a href="api/core#angularcore">@angular/core</a></li><li class="h2 ng-star-inserted" title="入口点"><a href="api/core#entry-points">入口点</a></li><li class="h3 ng-star-inserted" title="主要"><a href="api/core#primary">主要</a></li><li class="h3 ng-star-inserted" title="次要"><a href="api/core#secondary">次要</a></li><li class="h2 ng-star-inserted" title="主入口点的导出"><a href="api/core#primary-entry-point-exports">主入口点的导出</a></li><li class="h3 ng-star-inserted" title="模块"><a href="api/core#ngmodules">模块</a></li><li class="h3 ng-star-inserted" title="类"><a href="api/core#classes">类</a></li><li class="h3 ng-star-inserted" title="装饰器"><a href="api/core#decorators">装饰器</a></li><li class="h3 ng-star-inserted" title="函数"><a href="api/core#functions">函数</a></li><li class="h3 ng-star-inserted" title="结构"><a href="api/core#structures">结构</a></li><li class="h3 ng-star-inserted" title="类型"><a href="api/core#types">类型</a></li></ul></div></aio-toc></aio-lazy-ce></div><footer class="no-print"><aio-footer><div class="grid-fluid"><div class="footer-block ng-star-inserted"><h3>资源</h3><ul><li class="ng-star-inserted"><a class="link" href="about" title="Angular 贡献者。">关于</a></li><li class="ng-star-inserted"><a class="link" href="resources" title="网络上的 Angular 工具、培训、博客等">资源列表</a></li><li class="ng-star-inserted"><a class="link" href="presskit" title="我们的联系方式、LOGO 和品牌">宣传资料</a></li><li class="ng-star-inserted"><a class="link" href="https://blog.angular.io/" title="Angular 官方博客">博客</a></li><li class="ng-star-inserted"><a class="link" href="analytics" title="Angular 使用情况分析">使用情况分析</a></li></ul></div><div class="footer-block ng-star-inserted"><h3>帮助</h3><ul><li class="ng-star-inserted"><a class="link" href="https://stackoverflow.com/questions/tagged/angular" title="Stack Overflow: 这里的社区会回答你关于 Angular 的技术问题">Stack Overflow</a></li><li class="ng-star-inserted"><a class="link" href="https://gitter.im/angular/angular" title="和老鸟聊 Angular">Gitter</a></li><li class="ng-star-inserted"><a class="link" href="https://github.com/angular/angular/issues" title="在 github 上报告问题和建议。">报告问题</a></li><li class="ng-star-inserted"><a class="link" href="https://github.com/angular/code-of-conduct/blob/master/CODE_OF_CONDUCT.md" title="让我们彼此尊重">行为规范</a></li></ul></div><div class="footer-block ng-star-inserted"><h3>社区</h3><ul><li class="ng-star-inserted"><a class="link" href="events" title="Angular events around the world.">活动</a></li><li class="ng-star-inserted"><a class="link" href="http://www.meetup.com/topics/angularjs/" title="参加聚会，向别的开发人员学习">聚会</a></li><li class="ng-star-inserted"><a class="link" href="https://twitter.com/angular" title="Twitter">Twitter</a></li><li class="ng-star-inserted"><a class="link" href="https://github.com/angular/angular" title="GitHub">GitHub</a></li><li class="ng-star-inserted"><a class="link" href="contribute" title="向 Angular 做贡献">做贡献</a></li></ul></div><div class="footer-block ng-star-inserted"><h3>多语言</h3><ul><li class="ng-star-inserted"><a class="link" href="https://angular.io/" title="English Version.">English Version</a></li><li class="ng-star-inserted"><a class="link" href="https://angular.tw/" title="正體中文版">正體中文版</a></li><li class="ng-star-inserted"><a class="link" href="https://angular.jp/" title="日本語版">日本語版</a></li><li class="ng-star-inserted"><a class="link" href="https://angular.kr/" title="한국어">한국어</a></li></ul></div></div><p>Super-powered by Google ©2010-2020. 代码授权方式：<a href="license" title="License text">MIT-style License</a>. 文档授权方式：<a href="http://creativecommons.org/licenses/by/4.0/">CC BY 4.0</a>.</p><p>当前版本：9.0.1-build.109+sha.7a49faba.</p></aio-footer></footer><div class="cdk-visually-hidden ng-star-inserted"><mat-icon role="img" class="mat-icon notranslate material-icons mat-icon-no-color" aria-hidden="true">&nbsp;</mat-icon></div></aio-shell><noscript><div class="background-sky hero"></div><section id="intro" style="text-shadow:1px 1px #1976d2"><div class="hero-logo"><img src="assets/images/logos/angular/angular.svg" width="250" height="250" alt="Angular"></div><div class="homepage-container"><div class="hero-headline">一套框架，多种平台<br>移动 &amp; 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